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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd3ea6c709e08de1853f627605b32ab4bffc8913f21f5e17388cc7f518e0700' 
  AND token = 'yBliGkvnKGlB2sD6S77S5Ldb6q9VxT0Mp8NPIRPjMrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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