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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fcab7d0807f9cb1254ecf62f0d2d4b9e29fa51966eb9c05e8a3c8758e7edbf' 
  AND token = 'mFcNNNx8hpx7v68zlctVsi0aC2NV30U5tZm5Ps+qy+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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