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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d12ee1bebc846be7ca4c085e6b69b0f2abf8ce676fc3ee5af285d1d4df6e662' 
  AND token = 'o7Y9P5gKsl1y9PAtM21XJeqlxbt8CQwzFuwE4ZFnqHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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