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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eab9741e885a0646124e10e5e2da169a32e38450df51805e950539fe892ad27' 
  AND token = 'o/vx+SeJ0d/TzI+LS2ZL+qVlGka2ZHKsry+HHVud7mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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