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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87bbbe4d1978f8c8a4c69425134cccaf10bc0918ab588976c90681ccb9b29ec9' 
  AND token = 'FPHIncoiSvhKIahQ89tT4P1L1UQdACh2tmfiNb8Uw4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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