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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b89ebd716a1ed8dc8ba18d01855af1e1d05a9463908b6d4fa47ceea0596f76' 
  AND token = '+JN68IXjWdAo4KkAVN3F3Vll9raWdC828ywiU5mt9GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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