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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b223d3b76d8606d8b7fa03b96e06a154a90d3778515385fda7b74f6ad6179a1a' 
  AND token = '9DsRgLFLhTR/aN7MnX+SCqcLQrbBP+bXpEv27rkz/3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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