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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062a19197455b477a76b09824ec6836bf75d765ffc9535ab55638779fbe37ccc' 
  AND token = 'z2X5Y3eyA/803alyR7R/tri6zvg53QSCbvmxgL92+uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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