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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e301f6808000581baed635e7354760a0b086b98a3a0cd54965165a7860b04df4' 
  AND token = 'aH8msYQBpTiYE0poQO1eukb8VtcoF7tpDhxco2aOEd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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