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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c70630824dac5f65136af82551d1cf8445e67cdb5abee8f65cd6fcd976a71e' 
  AND token = 'eWeMC/FF9k22XhsZqIG1pGHVudzsQUMDUXmTKuqFpro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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