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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edae84dd65ef453bee8f5ff5dc4ee30eaf7594a8faf5475845eabe48e5807e44' 
  AND token = 'zBywKg05zQD10wPyjzZAYAnQJTgDQ/KnEb3sPGwqOL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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