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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51750c9263700d1a6e757f3c42f47699e624e809a334e77de9212718b83fa82' 
  AND token = '7y6T8Pu9QtCTIRPtDGVg6Fft42baQwYFNuIv7ByU29Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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