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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6390e17db47a468c21ccb30511da0e88360fadca42ca55a3dfbfb3bb1f09e8e' 
  AND token = 'rZzUnuCwdtNdkQA5ihWa+HlPfG3Uyg5u4E3dA216Rhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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