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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755ea7b4fcae73ea0c4060acc3ef40c069e751e2762b9b29c4dd8c320d304c98' 
  AND token = 'baNbKUCRG8JLAkIY93cbjDoJwOuhzeyJS3sVj38UvtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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