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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e4312e077390b6d907c71c55bd2e4bf5e19c5d264e63e9a7a9983627067677' 
  AND token = 'gWqq4wKMYcLYcBlJPzNA90yxKtAsSdVLDLU8QIMty1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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