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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e11f8a524e404c097816417a137f27ce08098c237198f59c74c4701c8bf5bf' 
  AND token = 'FISkuutAlT5Naxb4YBEeBPfyHZs861hmYeWM44+3C7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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