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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc647862c02909fe140714d3a1ab9e85a6f0dd5cffc45b052196111a5e8565d' 
  AND token = 'jKed8bUtMvfcb7sv1zzjC1pVCC/dC0MzeIkLy9fyv0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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