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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5034c1b0ca3cec26f3df0579dfd636a2f33d5773ec9749e8e6d88a1c2015690' 
  AND token = 'QV9sbHmcVqzYeZ23LBGLToG0GZx18bWO5cEMRhfWLtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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