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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfe89de300735c1d237fd6a447063c02b36eb65d4a864cd900594e0c390c8be' 
  AND token = '72hdU/HLiMO2hp1W0wyy2IBO6gddcpUKNpZ18ouqDWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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