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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fd3090f08377ae035c4ceb7908aaa522a0fb6c13ce9172be53e32508259666' 
  AND token = 'kNaDS5M2S/KJe1+qGz2f/BSEfdUrCCLO1zbT2cWT81M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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