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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e565eedb944f850919a8db14e10c8dd4ec8ef684e3256e4046b18e39090a7280' 
  AND token = '5C4tszOZReeyi3wLJlZt05szEiNV1z0H9vnsBUevKLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}