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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68d3aa049929b3b3479814aa4de421ef20e29452bc4d321e3fd6d75b587b519' 
  AND token = 'OMKPjNtN+WZXf3e4u7zkqk8Mcz32217/nRAl32ePWPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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