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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03710312dc83e1406d5314a0a90d58c33c336d2441cc428b46c3b2c41a9312be' 
  AND token = 'R6fGCnMl/7FH81IZb6oe2pZqnDIxb9rWAH1884UpAL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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