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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4a4a8a2de10e5266a5738a4fb8f35fb9f38b4292c352b7ed6da74fc05266e6' 
  AND token = 'NZyN8TyLuAJ6OwNeXD11iQ4ryhWY5VP58e+k5/1CUZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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