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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5982e6faa22ea13e489581b0285ed47226f807e7ea4b4af75693943eaf23897c' 
  AND token = 'i4f9TNd9gmcbvG5cJXbPuydGfduZjyYGK9/K0KJVL+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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