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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8efead0f0e790d5067b8d27126024253279be80b7f22dc3ff47bf1ed664bba04' 
  AND token = 'zly4k1zZOchMGC7m/5kGc7JQ2mCAEu0azZErjM7M/k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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