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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce81599735d69cdd7baaa0a0ef0ef1ea095bf28ff5d69611d7be1ab503eb4170' 
  AND token = 'vx0M4FcZRlyq+HTLVvEVPj0KZ5FdtKrtqCLCYq6r2vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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