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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17eaf1bfd32533fad590cd90250d4ff358382bca8a99066f79ef7a700480887' 
  AND token = 'KsNUyTJ/Xazrnlh6t3GGlbrMM6pQgvJRR7xarpF7l1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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