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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f4b05d0502a5c900311ddccfc681e332c6f42fcac8d0328458737749c97bfa' 
  AND token = 'S4N79G5MSY55ZJqMULsdo2bvVUH3G1k2KD0hSYJz39o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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