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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '759573bf26e727d92e20c698df7772341998e26d63214c52805dd8a7c596615e' 
  AND token = 'yfzkl5T56wtQ2Vtd7+f2gyKsOqdLJZqyi0JZtIvrLMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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