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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a009ca5504dc2e8c47348bbc7a792b5e5781b3273d2c50758ced6dbf85cfff5b' 
  AND token = 'h2VmSef15Xd0yVUvog3eRBT76eRdSnQD6v+mPfpQyU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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