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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f400dc89b25cfaf15eca5bd5f593d65ac005587128b4527ce51e17967117c98' 
  AND token = '9qtpb3p/nLx7kZsjsBSsp1SKdYgyN7Ru0aqxX5BQSpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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