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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954676955d629aa9255a3d3ff93cfce75e1c224a61fa5d227fc680aa2e95d3f6' 
  AND token = 'MkkFdqH7McZoAGgEEFaZOPAq4lKHAMefVPhGU16qhnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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