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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47f54bd95c61d53c6f6f1b38b2d32328ade6cde60782278d29952bc3569ddbe' 
  AND token = 'iGM9E+S7WTJ5Nv7hNxJzff+TOglgy6r8c/pMMCCu0Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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