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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246efff3203df9895d54f8acef59dc1f14f1a552e9c4cddd7ef1809b96434e12' 
  AND token = '7piLmH3bFDb8NWBOecEgvjlBW7/YDOvJIYA17PeFUgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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