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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe48779c4d5c14f8a62f3db17c817e663315bdcfab81923657194e6f0f5cbfe' 
  AND token = 'ZuXZCkUFJHqmOuAxXOL6xxiGaNMJL3/Upx4QZ4x51Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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