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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa96342212bb32744fd969915af05965ecfdfcd0296555f838af83d9cafa3649' 
  AND token = '7S9mXycW3i9gxFB94nBc+O80CmtelLWWXTm4m7kk97Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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