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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc58e6fc997cf8da97a632075f4980c3b42c01d07636e57159d2976c9e38a42' 
  AND token = 'v2f7EBJaCi4kpoNliKB8B7TnTd9Mo0qsoPLNj2BLCJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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