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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1843a3facdca383c56cccacad49ae7ca16cf3ea6c6d368324d19a7731d967090' 
  AND token = 'A7iGYKBRHeo148lBusdGdaehR8l9AAUEA396f2YU+Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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