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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7114dad040e2961dd4ec07aa7c3384b273e6197e57cce23919fba3b118335365' 
  AND token = 'XN2CLDjZqxN13HZSNRD8nScCpf6E6A9LFNzn1imOfeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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