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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25bd48dfbaafb62798a995fa6d95b88c6bc89b807eec0e57b967cad1aa5eebf' 
  AND token = '8XE47VFmGlOQ+esIl/SaHhtbSYH+ZTYJVl1GD0+G0x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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