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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d3f8318229be79eea22f31ad16c8fd869dbc2b96bae021e1645e11877ef28e' 
  AND token = 'tcCZqCe5ssRM8OZjMSbnwsK3tqkFsf9Kx68PNEtX1Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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