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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323ec3ff5e8e754201d764c7ea707e07f74e2f4d0106e209223e7f2424a9e9c5' 
  AND token = 'yTlVAIQ9ETW4geMGfEN847d+qsWBhQlawGxqcu/LI6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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