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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b394e27702e3278c2e79a6d8363dfd4832439cbf1433d31830cbdc149fee46' 
  AND token = 'GR/hl0qnYkFQemVZTNFOZHwN/rr0UfmKnDW1jKarKAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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