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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575f887ac8736973a04ae50ddbeec057f7d5a751a0806fe018e82e8e95da8f74' 
  AND token = 'LzNq97CdgC9tllpzwt2FeO6pljKWjzdgpB/AVUuy9TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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