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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfec505ba9da06c73666bdb568c95376bc2bb8d99076a02bd2afeca7f4cb51ad' 
  AND token = '/93+rVpWUoGWPgZ5S2VYoyNv3D1Dg9LND7LDhfoDScY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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