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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5ec2a70e2a0cc0fc061645a6987c313c4ebd35e594e759c832e45817c1c18d' 
  AND token = '+76uE2Rlb2io/FKtIpj0iYwHNZTbK5aP1Nr0/3kqf5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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