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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623e6ac1f5f0b06773129a631a3017eb7e68400240a136e4325df2e9c3872b6d' 
  AND token = 'mqQLYZdT3Rt0jT2civrhEYovfNd/AR14lXbw+2Os/Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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