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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3720d12e3b06eb69d8b0e06d6e42c1e6c3136cc23f06c3f8173fc4f9744308' 
  AND token = 'eeemCugIHDMQqtoy7cYKn+JTirThboPHG0N85+AsWek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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