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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacab299c5a0e7be2d4bf5391f5cd2fb5a79f8382a91817d6631e2495f16fb12' 
  AND token = '2S2RPuHfB9W+miMlBT2r2B3yXaABQJ3Tjtm8LSywH60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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