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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b307fb98510bced4599e770e24d482d41ef424c765b362516e618d64327c58' 
  AND token = 'Fo14xczUo7+xqF5xhn5g/xOgCE2n+C6gn1OnG1cgPHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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