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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee2282639593a0b3288f3227719fe250f0af7543343038eab4eaa2834d614f1' 
  AND token = 'OWpA3fJHzgrWrv0Ta2b/rIonvqlwBmhVFbe6OAGL6eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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