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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed888d85c7f60233829a209a0e01c398a2d2b26db610575d625fd7df7c690ac0' 
  AND token = 'Z3vwf4QXgflDri/OXcktp5Te1uGUk8egYnxODxWcr4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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