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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695cfada8f62b0b8df9a590999149624f168e97f5df0d14b14276db4f729629e' 
  AND token = 'uoR/zRQ+kCjI8k7JJ8r3A8j90hloF+ROV6y1Hp1fYKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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