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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f203af10b7e0c1a57de62ed4dbd267c094427da5c5a6c67458bedfd92d1937' 
  AND token = 'phm5Ra9jYUmRFijUpZ7AAJstOoFMljK21hbj3KDyaGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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