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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9751579e0acd72cf16ee23124fc5676d64bc5011f22283790bdf3e6a6b3599c3' 
  AND token = 'o90cEnsWFktT7Mm2r7j/Vf0npIFFMF9PH/VrkZG1qgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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